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    <title>Document</title>
    <script>
        // 题目描述：把下面数组的首尾两个元素互换
        var arr = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"]
        // [ arr[0], arr[arr.length - 1] ] = [arr[arr.length - 1], arr[0]]
        // console.log(arr);
        temp = arr[0]
        arr[0] = arr[arr.length - 1]
        arr[arr.length - 1] = temp
        console.log(arr);
    </script>
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